Configuration interface to be implemented by most if not all PropertyResolver
types. Provides facilities for accessing and customizing the
ConversionService
used when converting property values from one type to another.

setConversionService

Note: as an alternative to fully replacing the
ConversionService, consider adding or removing individual
Converter instances by drilling into getConversionService()
and calling methods such as #addConverter.

setIgnoreUnresolvableNestedPlaceholders

Set whether to throw an exception when encountering an unresolvable placeholder
nested within the value of a given property. A false value indicates strict
resolution, i.e. that an exception will be thrown. A true value indicates
that unresolvable nested placeholders should be passed through in their unresolved
${...} form.

Implementations of PropertyResolver.getProperty(String) and its variants must inspect
the value set here to determine correct behavior when property values contain
unresolvable placeholders.